CALIFORNIA MICRO DEVICES
PAC 27A03
P/ACTIVE PRECISION VOLTAGE DIVIDER
NETWORK FOR LINEAR TECHNOLOGY LT1430/1017
Features
Provides a complete Pentium Pro regulator
solution when combined with a Linear Technology
LTC1430/LT1017 Power Supply Regulator Chip
Thin film tightly ratio matched resistors
using P/Active technology
SOIC and QSOP Package
Applications
Pentium Pro Power Supply Regulator
Refer to AP-202 Voltage Divider Application Note for
further information.
Product Description
CMDs P/Active 27A03 Precision Voltage Divider Network is designed to work with the Linear Technology LTC1430 High
Power Step-down Switching Regulator Controller. CMDs P/Active technology provides precision ratio tracking over tem-
perature range required for the proper voltage regulation in Pentium Pro-based regulator designs.
STANDARD SPECIFICATIONS
Absolute Tolerance (R)
±5%
o
o
Ratio Tracking (0 C
≤
T
A
≤
70 C)
(Voltage per resistor <10 volts and power
per resistor <25mW)
R11/R12
±0.25%
R1/R6
±0.25%
R1/R7
±0.5%
R1/R8
±1.0%
R1/R9
±2.0%
R1/(R2+R3+R4+R5)
±0.25%
(R3+R4+R5)/(R1+R2)
±0.5%
(R4+R5)/(R1+R2+R3)
±0.5%
R5/(R1+R2+R3+R4)
±0.5%
Operating Temperature Range
0
o
C to 70
o
C
Power Rating/Resistor
25mW @ 70
o
C
Storage Temperature
-65
O
C to +150
O
C
Package Power Rating
1.00W, max.
STANDARD VALUES
Resistor (R)
Value (Ohms)
R1
17600
R2
14219
R3
2381
R4
833
R5
12858
R6
27770
R7
55600
R8
111260
R9
222580
R10
1000
R11
33000
R12
33000
R13
47000
R14
47000
R15
47000
© 1993, 1996 CMD Corp. All rights reserved.
8/96
SCHEMATIC CONFIGURATION
16
6
R9 R8 R7 R6 R2
R1
R13
7
R10
5
11 10 9
13
R4
R14
15
R11
8
12
R3
4
R12
14
2
R5
R15
3
1
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
CALIFORNIA MICRO DEVICES
PAC 27A03
Package
Pins
Style
16
SOIC Narrow
16
QSOP
ORDERING INFORMATION
Ordering Part Number
Tubes
Tape & Reel
PAC27A03S/T
PAC27A03S/R
PAC27A03Q/T
PAC27A03Q/R
Part Marking
PAC27A03
PAC27A03
Application Diagram
LT 1017
5
SENS
+
SENS 7
VTRIM 6
LT 1430
+
+
POWER
GOOD
+5V
PAC 27A03
1
2
3
4
5
16
15
14
13
12
11
10
9
+
1.2V
REFERENCE
LT 1004
10.7K
5.76K
Vcc SENSE
680pF
VOLTAGE
SELECTS
MSB
10
6
7
8
TO OVER
VOLTAGE
CIRCUITRY
LSB
74AC125
LT 1430/LT 1017
©1993, 1996 CMD Corp. All rights reserved.
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
8/96
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